US 12,444,734 B2
Anode active material, method for preparing anode active material, anode comprising same, and lithium secondary battery
Dong-Sub Jung, Daejeon (KR); Hyun-Chul Kim, Daejeon (KR); Chang-Ju Lee, Daejeon (KR); and Sang-Wook Woo, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/764,808
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Sep. 29, 2020, PCT No. PCT/KR2020/013427
§ 371(c)(1), (2) Date Mar. 29, 2022,
PCT Pub. No. WO2021/066580, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 10-2019-0121071 (KR), filed on Sep. 30, 2019.
Prior Publication US 2022/0393154 A1, Dec. 8, 2022
Int. Cl. H01M 4/36 (2006.01); C01B 32/21 (2017.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/1393 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [C01B 32/21 (2017.08); H01M 4/0471 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/587 (2013.01); C01P 2004/61 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 10/0525 (2013.01)] 9 Claims
 
1. A negative electrode active material, comprising:
a graphite core;
a crystalline first carbon coating layer on the graphite core; and
a crystalline second carbon coating layer on the crystalline first carbon coating layer,
wherein a crystallinity of the crystalline second carbon coating layer is lower than a crystallinity of the crystalline first carbon coating layer, or
wherein the crystalline second carbon coating layer comprises hard carbon and the crystalline first carbon coating layer comprises soft carbon, and
wherein a D band of the crystalline second carbon coating layer has a full width at half-maximum (FWHM) value corresponding to 1.3 times or more of a FWHM value of a D band of the crystalline first carbon coating layer.